Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (103)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Turbeville, J. M.
Right arrow Articles by Raff, R. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Turbeville, J. M.
Right arrow Articles by Raff, R. A.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Molecular Biology and Evolution, Vol 9, 235-249, Copyright © 1992 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Phylogenetic position of phylum Nemertini, inferred from 18S rRNA sequences: molecular data as a test of morphological character homology

JM Turbeville, KG Field and RA Raff
Department of Biology, Indiana University, Bloomington 47405.

Partial 18S rRNA sequence of the nemertine Cerebratulus lacteus was obtained and compared with those of coelomate metazoans and acoelomate platyhelminths to test whether nemertines share a most recent common ancestor with the platyhelminths, as traditionally has been implied, or whether nemertines lie within a protostome coelomate clade, as suggested by more recent morphological analyses. Maximum-parsimony analysis supports the inclusion of the nemertine within a protostome- coelomate clade that falls within a more inclusive coelomate clade. Bootstrap analysis indicates strong support for a monophyletic Coelomata composed of a deuterostome and protostome-coelomate clade. Support for a monophyletic protostome Coelomata is weak. Inference by distance analysis is consistent with that of maximum parsimony. Analysis of down-weighted paired sites by maximum parsimony reveals variation in topology only within the protostome-coelomate clade. The relationships among the protostome coelomates cannot be reliably inferred from the partial sequences, suggesting that coelomate protostomes diversified rapidly. Results with evolutionary parsimony are consistent with the inclusion of the nemertine in a coelomate clade. The molecular inference corroborates recent morphological character analyses that reveal no synapomorphies of nemertines and flatworms but instead suggest that the circulatory system and rhynchocoel of nemertines are homologous to coelomic cavities of protostome coelomates, thus supporting the corresponding hypothesis that nemertines belong within a protostome-coelomate clade. The sequence data provide an independent test of morphological character homology.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Mol Biol EvolHome page
T. H. Struck and F. Fisse
Phylogenetic Position of Nemertea Derived from Phylogenomic Data
Mol. Biol. Evol., April 1, 2008; 25(4): 728 - 736.
[Abstract] [Full Text] [PDF]

Home page
 Integr. Comp. Biol.Home page
J. R. Garey
The Lesser-Known Protostome Taxa: An Introduction and a Tribute to Robert P. Higgins
Integr. Comp. Biol., July 1, 2002; 42(3): 611 - 618.
[Abstract] [Full Text] [PDF]

Home page
 Integr. Comp. Biol.Home page
J. M. Turbeville
Progress in Nemertean Biology: Development and Phylogeny
Integr. Comp. Biol., July 1, 2002; 42(3): 692 - 703.
[Abstract] [Full Text] [PDF]

Home page
 Integr. Comp. Biol.Home page
K. M. Halanych and Y. Passamaneck
A Brief Review of Metazoan Phylogeny and Future Prospects in Hox-Research
Integr. Comp. Biol., June 1, 2001; 41(3): 629 - 639.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
S. Buckingham and A. Spencer
K(+) currents in cultured neurones from a polyclad flatworm
J. Exp. Biol., January 10, 2000; 203(20): 3189 - 3198.
[Abstract]

Home page
 J. Biol. Chem.Home page
T. L. Vandergon, C. K. Riggs, T. A. Gorr, J. M. Colacino, and A. F. Riggs
The Mini-hemoglobins in Neural and Body Wall Tissue of the Nemertean Worm, Cerebratulus lacteus
J. Biol. Chem., July 3, 1998; 273(27): 16998 - 17011.
[Abstract] [Full Text] [PDF]

Home page
 Proc. Natl. Acad. Sci. USAHome page
J. W. Valentine
Cleavage patterns and the topology of the metazoan tree of life
PNAS, July 22, 1997; 94(15): 8001 - 8005.
[Abstract] [Full Text] [PDF]

Home page
 Proc. Natl. Acad. Sci. USAHome page
S. I. Tomarev, P. Callaerts, L. Kos, R. Zinovieva, G. Halder, W. Gehring, and J. Piatigorsky
Squid Pax-6 and eye development
PNAS, March 18, 1997; 94(6): 2421 - 2426.
[Abstract] [Full Text] [PDF]

Home page
 ScienceHome page
G. A. Wray, J. S. Levinton, and L. H. Shapiro
Molecular Evidence for Deep Precambrian Divergences Among Metazoan Phyla
Science, October 25, 1996; 274(5287): 568 - 573.
[Abstract] [Full Text]

Home page
 DevelopmentHome page
M. Martindale and J. Henry
Modifications of cell fate specification in equal-cleaving nemertean embryos: alternate patterns of spiralian development
Development, January 10, 1995; 121(10): 3175 - 3185.
[Abstract] [PDF]


Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.